Correct Answer: B

Rationale: When dealing with contaminated instruments used during delivery, it is crucial to soak them in a 0.5% chlorine solution for 30 minutes to ensure proper disinfection. This practice helps eliminate potential pathogens and ensures the safety of both the healthcare provider and the patient.

Correct Answer: A

Rationale: The odds ratio is a measure of association between an exposure and an outcome. In this context, an odds ratio of 2.49 indicates that individuals with hypertension are approximately 2.5 times more likely to develop severe COVID-19 compared to those without hypertension. Therefore, choice A is correct as it accurately defines the role of odds ratio in assessing the relationship between an exposure (hypertension) and an outcome (severe COVID-19). Choices B, C, and D are incorrect as they do not describe the nature of odds ratio.

Correct Answer: B

Rationale: The Patient Centered Medical Home (PCMH) model is designed to provide comprehensive care, prioritize patient needs, and ensure that healthcare providers work together to coordinate care effectively. However, guaranteeing safety at home is not a specific characteristic of the PCMH model. Home safety is an important aspect of patient care but is not explicitly part of the PCMH model's core principles.

Correct Answer: B

Rationale: The nurse is providing care to a patient at home, which falls under the realm of community-based nursing. Community-based nursing involves providing healthcare services outside of traditional healthcare facilities, such as in patients' homes or community settings, to promote health and wellness and prevent hospital readmissions.

Correct Answer: C

Rationale: Special interest groups often exert significant influence on legislators, making it challenging to pass tighter gun control laws. These groups may lobby against such legislation, impacting the decision-making process of lawmakers. This influence can hinder the progress of bills related to gun control, despite potential public support or health implications.